{
        int rollno,marks;
        String name,m1,rno;
        rno=t1.getText().toString();
        name=t2.getText().toString();
        m1=t3.getText().toString();
        rollno=Integer.parseInt(rno);
        marks=Integer.parseInt(m1);
        try {
            db.execSQL("insert into stud values('" + rollno + "','" + name + "','" + marks + "');");
            Toast.makeText(getApplicationContext(), "Data saved", Toast.LENGTH_LONG).show();
        }
        catch(Exception e)
        {
            Toast.makeText(getApplicationContext(), "Data already present", Toast.LENGTH_LONG).show();

        }

      }